The brown rat.

A brown rat. / (slang) A neglected boy who lives around the wharfs. / (slang) A man who hangs around a wharf in the hope of finding temporary work there.

Alternative spelling of pack rat

Any of several small North American rodents, of the genus Neotoma, that have bushy tails. / One who collects or hoards, especially unnecessary things.

A common species of rat, Rattus rattus, originating anciently in Asia but now distributed worldwide.

Alternative spelling of mole-rat.

Alternative form of rattrap

plural of rat trap

(US, slang) usually a little child, up to the age of six years.

Alternative spelling of rat-arsed